S = input()

if("RRR" in S):
    print(3)
elif("RR" in S):
    print(2)
elif("R" in S):
    print(1)
else:
    print(0) S = input() S input() input if("RRR" in S):
    print(3)
elif("RR" in S):
    print(2)
elif("R" in S):
    print(1)
else:
    print(0) "RRR" in S "RRR" S print(3) print 3 elif("RR" in S):
    print(2) "RR" in S "RR" S print(2) print 2 elif("R" in S):
    print(1) "R" in S "R" S print(1) print 1 print(0) print 0 S = input() input() S
S = input()

if("RRR" in S):
    print(3)
elif("RR" in S):
    print(2)
elif("R" in S):
    print(1)
else:
    print(0)